Die rolling machine



5 Sheets-Sheet 1 Filed July 21, 1952 INVENTOR.

Jan. 17, 1956 J. GAVURIN DIE ROLLING MACHINE Filed July 21, 1952 5 Sheets-Sheet 2 INVENTOR. BYfiW/M Jan. 17, 1956 J. GAVURIN 2,730,916

DIE ROLLING MACHINE 5 Sheets-Sheet 4 J. GAVURIN DIE ROLLING MACHINE Jan. 17, 1956 Filed July 21, 1952 INVEN TOR.

Jan. 17, 1956 J. GAVURIN 2,730,916

DIE ROLLING MACHINE Filed July 21. 1952 5 Sheets-Sheet 5 INVENTOR.

*' f g/m United StatesPatent O DIE ROLLING MACHINE Jacob Gavurin, Brooklyn, N. Y.

Original application May 25, 1949, Serial No. 95,309, now Patent No. 2,603,854, dated July 22, 1952. Divided and this application July 21, 1952, Serial No. 300,027

4 Claims. (Cl. 80- 2) This invention relates to improvements in die rolling machines and relates more specifically to an improved roller forging apparatus having an improved roller assembly and blank feeding and shaping means. The present application constitutes a division of my applica tion Serial No. 95,309, now Patent No. 2,603,854.

The forging blanks by die rolling methods has certain advantages over a drop forging arrangement and the general method more readily lends itself -to continuous and automatic treatment of the stock. Difficulty has usually been experienced in the feeding of the stock to the dies and in maintaining the blanks in perfectly flat condition during the rolling operation as well as after they leave the die.

An important object of the present invention is to provide a machine which feeds the stock continuously to the rolling dies with heating means for the stock if such is required, the machine having an improved die rolling assembly and means for preventing lateral distortion of the blank flash during the die rolling operation. The complete machine further has an improved punching and trimming assembly and if the work is of such character as to require cooling before the trimming operation, novel conveyor means are provided for transporting the rolled blanks which have been cut from the feeding stock a suflicient distance to allow for cooling before they are introduced to the trimming and punching assembly.

The conveying, punching and trimming and assembly forms the subject matter of my co-pending application, Serial No. 98,180, filed June 10, 1949, now Patent No. 2,604,164, although it is an integral part of the entire machine which performs all of the aforesaid operations in a continuous, fully automatic fashion. s

The feeding, heating, shaping, die rolling and finished blank delivering assembly which forms the subject matter of the present application is a compact unit which is readily adjustable to take stock of varying sizes and the dies associated with the rollers are readily replaceable with dies for forming different operations, thus providing a flexible assembly for accurately forming all sorts of articles.

Another object of the invention is to provide a novel die rolling assembly wherein the dies have complemental matrix grooves which form theblank and one of the dies has side walls on the sides of the grooves to limit lateral flow of the metal, such side walls passing into recesses in the other die.

A further object of the invention is to provide novel means for grasping the leading edge of the formed blank as it emerges from the matrix grooves, preventing distortion of the blank and delivering it in perfectly flat condition for the next operation.

Another object of the invention is to provide side wall sections on one of the dies and recesses on the other die receiving such side walls for preserving the true shape of the blank and preventing lateral distortion. In most any article forged by the machine of the present invention, various parts of the article have a greater thickness than other parts. As the metal flows into the die recesses it has a tendency to move laterally as it emerges from the dies and articles intended to be straight are rendered non-straight. With the arrangement of the present in vention, the side walls prevent this occurrence.

A further object of the invention is to provide improved means for bending the stock to the general shape of the die recesses which it is about to enter. This comprises novel jaw members which operate automatically to bend the stock to the desired shape. The jaws are capable of infinite adjustments to produce any desired lateral bend in the stock.

Yet another object of the invention is to provide novel rotary brushes .for cleaning the roller dies after each forging operation.

In the drawings:

Fig. l is a broken plan view of the feeding and heating sections of a machine embodying the present invention.

Fig. 2 is a broken horizontal section taken through the forward or rolling section of the machine.

Fig. 3 is a broken vertical section taken through the feeding section of the machine.

Fig. 4 is a broken vertical section taken through the rolling section of the machine.

Fig. 5 is a broken transverse section taken on line 5-5 of Fig. 3. p v

Fig. 6 is a broken transverse section taken on line 6-6 of Fig. 3.

Fig. 7 is a broken plan view of the assembly for bending the stock to assume the general contour of the dies.

Fig. 8 is a broken perspective view of the mechanism for operating the feeding section of the machine.

Fig. 9 is similar to Fig. 8 but shows a different position of the cams.

Fig. 10 is a broken transverse section taken on line 10-10 of Fig. 2.

Fig. 11 is a front elevation of a portion of the bending mechanism.

Fig. 12 is a vertical section taken through the die assembly.

Fig. 13 is a broken section taken on line 13-43 of Fig. 12.

Fig. 14 is a broken section taken on Fig. 12.

Fig. 15 is a front elevation of the cam assembly on the upper die.

Fig. 16 is a broken section taken on line 16-16 of Fig. 15. p I

Fig. 17 is a developed view of one of the arcuate dies.

Fig; 18 is a developed view of a second arcuate die.

Spaced frame members 10 and 11 form bearings for an upper shaft 12 which carries an upper die assembly 13, and a lower shaft 14 which carries a lower die assembly 15 and when the work is fed, as hereinafter described, through the rotary die assemblies, it is rolled to shape between the die elements.

Power is applied to an extension 16 of the upper shaft by suitable driving means (not shown). Gears 20 and 21 keyed to this shaft drive gears 22 and 23 keyed to shaft 14. Shaft 12 also has keyed thereto gears 24 and 25 which drive gears 26 and 27 respectively, which are carline 14-44 of tied by stub shafts 28 journalled in or secured to the frame members 10 and 11.

Gears 26 and 27 drive the work feeding means as follows: Cranks 31 and 32 are rigidly secured to such gears radially thereof. Links 33 and 34, respectively, are pivotally secured at one end thereof to the outer terminals of cranks 31 and 32. The opposite ends of such links are pivotally secured to an assembly 35 which includes inwardly movable jaws 36 and 37 carried by slides 41 and 42 which are mounted for such sliding movement in blocks 43 and 44 to which links 33 and 34 are pivoted as Patented Jan. 17, s

3 aforesaid. The splined key'way arrangement between slides 41-42 and blocks 4344 is shown in Fig. 8.

The feeding end of the machine includes a transverse frame member which connects longitudinal frame member 46 and 47. It further includes an upper frame member 51 which connects frame member 45 'With a fixed frame member 52. It will be apparent from the foregoing that as gears 26 and 27 rotate, reciprocating motion is imparted to assembly 35 and inward movement of the jaws 36 and 37 to advance the work during forward movement of the assembly is produced by the following means: Each of blocks 43 and 44 carries a cam 53 which is pivoted thereon at 54 (Fig. 8). As the assembly moves almost to the limit of its rearward travel the lower ends of earns 53 contact stops 55 carried by frame member 45. This rotates the cams 53 in a counter-clockwise direction when viewed as in Fig.8 and an upper cam sur face 56 acts against a diagonal surface 60 forming part of lower extension 61 of slide 42 (and 41). This moves the slide inwardly and further engagement between the inner surface of cam 53 and extension 61 retains the block in its inward position.

For stock of varying diameters the inward position of jaws 36 and 37 is adjusted by means of a screw and slot arrangement shown at 62 whereby the fixed position of the jaw is adjusted inwardly or outwardly on its slide.

Blocks 43 and 44 are provided with tracks 71 which move in trackways 72 in a central frame member 73.

As the assembly 35 moves forwardly cam 53 eventually contacts a cam lifter 64 which is carried at each end of a slide 65. Adjustment of the position of slide 65 and cam lifters 64 is effected by a lead screw 66 operated by a thumb turn 67. Any suitable scale 68 may be used to quickly indicate an adjusted, fixed position of slide 65 which may carry an indicatingfinger 69.

It will be apparent from the foregoing that as feeding assembly 35 moves rearwardly to its starting position earns 53 engage stops 55 moving the cams in a counterclockwise direction (Fig. 8) and this cam surface 56 forces extensions 61 of blocks 41 and 42 inwardly. They are retained in this position by the locking effect of the inner surface of cam 53 against the outer surface of extensions 61. Jaws '36 and 37 have previously been adjusted to the width or diameter of the stock. When these jaws move inwardly, thus firmly engaging the stock therebetween, the assembly commences its forward movement and carries the stock in the direction of the rollers for a distance determined by the adjusted position of slide 65 which carries cam lifters 64. When cams 53 contact cam lifters 64 (Fig. .9) the cams are moved in the opposite direction, thus freeing blocks 41 and 42 for outward movement which is effected by springs '59 (Fig. 5 The work is now freed and the assembly again moves rearwardly to starting position.

If the stock is to be heated before the die forming operation a channel shaped member in the line of travel of the rod is provided with any suitable heating means 74. This channel is movable rearwardly and is swingable from the position shown in Fig. 1 in order to enabledie replacement work to be performed on the lower die assembly 15. Supporting means for the channel may comprise a hub 76 carried on the lower surface of the channel which also supports a stud 77 which is receivable in a socket 81 carried by a slide 82 mounted for sliding movement in a frame 83 supported by a bracket 78. The need for this sliding movement of the channel is occasioned by the fact that the channel must be moved longitudinally rearwardly before it can be swung in an arc. Rollers 84 facilitate this sliding movement. A rack 85 on the lower surface of slide 82 is engaged by a pinion 86 keyed to a manually rotatable shaft 87. Thus, when the pinion is rotated in a counter-cloekwise direction (Fig. 3) it moves the channel assembly rearwardly. Shaft 87 may be rotated by applying a key to a non-circular terminal of shaft 87. Nuts 91 carried by bolts 92 4 are now loosened. 'Ihese bolts are carried by llange 93 on slide 82, and pass through arc'uate slots 94 in such flange.

For the purpose of further guiding the work between jaws 36 and 37 and the channelled heater 75 there is an auxiliary frame member hinged at 101 on transverse frame member 52. The uppersurface of this hinged plate is provided with guide angles 102 and when the heater is to be retracted plate 100 may be disengaged from its connection 99 with the channel and be swung downwardly.

The bar stock 104 which has been fed in the foregoing manner is now arranged to be bent to cause it to overlay the die openings by the bending assembly 105. This assembly is carried on a plate 106 rigidly mounted at the forward end of the heater channel 75 and comprises arcuate jaw members 107 and 108 which are hinged on such plate by means of pins 109 which are mounted in slots 110, the slots making it possible to adjust the loca tion of the pivots. I

Means for moving the jaws inwardly comprise rods 114 and 115 which are connected at to assembly 35 and are arranged to move forwardly as' the assembly is so moved. Brackets 123 carrying pins 122 are secured to such rods and such pins are disposed in elongated slots 121 in links 124 and 125. For the purpose of adjusting brackets 123 relative to rods 114--115 a pin and slot connection 119 may be used. These links are pivotally connected at their forward ends at 126 to jaws 107 and 108. The reason for this pin and slot driving connection between brackets 123 carried by rods 114 and 115, and links 124 and 125 is that the rods move over a longer stroke than do the links which close the jaws.

For the purpose of urging links 124 and 125 rearwardly their rear terminals are connected with springs secured to a cross-piece 131 mounted on the bottom of channel 75. Any other suitable means may be employed for retracting links 124-125.

It will be seen from the foregoing that as rods 114-115 move forwardly pins 122 reach the forward ends of slots 121 and at this time links 124125 move forwardly thus causing the jaw portions 132 of members 107-108 to a move inwardly '(Fig. 7) thus bending the stock. On the rearward travel of links 124125 the stock is held against movement by clamping members 133134 pivoted at 135. These members have inwardly facing serrated edges 136 which bite into the stock. They have upwardly extending slotted fingers 137 which are engaged by cam means to be described which move the clamping members inwardly to clamping position.

Guide blocks 141 between which the stock passes have pin-and slot connections 142 with plate 106 to move such blocks to an adjusted fixed position. These blocks have forward extensions 138 which support the pivot pins for the clamping member. Thus, as guide blocks 141 are moved inwardly or outwardly to accommodate stock of different widths they carry the clamping members inwardly or outwardly.

The numerous adjustments for the parts of this bending assembly are necessary in order to accommodate stock of different widths and also to achieve the desired angle in the bend. For instance, in Fig. 7, jaw member 108 is disposed farther forwardly than is jaw member 107 which bends the stock in the direction of jaw member 107. If the bend were to be in the opposite direction, the pivot 109 for jaw member 107 would be moved further forwardly .in its slot 110 and the other pivot pin would be moved rearwardly.

The rotary die arrangement will now be described. Upper die assembly 13 is formed in two complementary sections 147- and 148 having central recesses 149 to re-' ceive the central non-circular section 150 of shaft 12 and "they are suitably bolted together. Sections 147-148 have anannular recess 153 which receives one die block assume part which is illustrative only. The block further has spaced recesses 156 on its outer periphery which receive arcuate stops 157 for a purpose to be described. The block is held in place by clamps 160. A cutoff knife 161 severs the blank from the stock and in the event that a short piece remains at the end of the stock such short piece is prevented from falling by a plate 139 hinged at 140.

The lower die assembly 15 is similarly formed in two complementary sections 164 and 165 which again have central complementary recesses 166 to be received on the central square section of shaft 14. The die 167 has a recess 168 which forms the opposite face of the scissors part. This arcuate die is also suitably secured to the member 164 in an annular recess 171. On each side of the die section there are formed recesses 169 which receive stops 157 during rotation of the assemblies. Thus, as the two die assemblies rotate with the work therebetween the metal flows into die recesses 155 and 168 and such metal is prevented from travellingbeyond the opposed edges of the die members due to thestop members 157 passing into the recesses 169. Any excess metal may pass into arcuate recesses 174 formed in die member 154 adjacent stops 157.

The slotted fingers 137 are arranged to move inwardly to exert a clamping action on the stock after the dieforming operation by means of an assembly 176 shown in detail in Figs. 15 and 16 and which trails the upper die member 154 in the upper die assembly 13. This assembly includes spaced arcuate plates 177 and 178 which are maintained in their spaced relation by means of threaded studs 179 carrying nuts 180 on each side of the plates. The plates are secured to the upper due assembly by means of bolts 181 passing through such plates and also passing through an arcuate bracket 182 which is secured to the assembly by means of bolts 183. The outer periphery of each plate has an outwardly offset portion 184 which forms a cam and which enters the recess in each slotted finger 137 which moves the finger outwardly and accordingly the serrated edge 136 at the opposite end thereof, inwardly.

For the purpose of suitably guiding the forward end of the material as the same is compressed between the die members, an assembly 190 is employed. This assembly includes a bracket 191 which is mounted at the rear terminal of a plunger 192 located in an aperture 193 in a fixed frame member 194. The bracket is moved outwardly by means of a spring 195 which acts against a shoulder 196 in plunger 192. The bracket is further supported for sliding movement on frame 194 by tracks 197 which move in trackways 198 in the frame. The bracket includes a lower Wall 199 and an upper wall 200 in spaced relation to the lower wall. Each of these walls has slots 201 which receive bolts 202 to support upper and lower spaced fingers 203 and 204. As the dies rotate the forward edges thereof contact the fingers 203 and 204 and move the same forwardly at the same speed as the stock travels. Thus, any tendency of the stock to remain in either the upper or lower die after it has been forged, is eliminated by these fingers which always retain the stock in a straight line position relative to the meeting faces of the two die members.

For the purpose of retaining the die openings perfectly clear at all times, upper and lower rotary brushes, shown diagrammatically at 206 and 207 mounted on shafts 208 and 209, respectively, engage the upper and lower dies and rotate continuously during the operation.

The functions and operations of the several parts of the machine have been described as this specification has proceeded and its operation as a whole will now be described. The stock is fed between fingers 36 and 37 where it is grasped and delivered forwardly to the heating unit 75 and upon forward travel it is grasped between bending jaws 107 and 108 where it is bent to assume the contour of the die openings. It is delivered to the die rollers while still hot and upon passing therebetween the blank is forged to shape.

During this operation it is retained against lateral displacement by side walls 157. The flash also flows into recesses 174 alongside these side walls giving the marginal edges of the flash a slightly greater thickness than the intermediate sections so as to facilitate its being handled in the trimming and punching machine of my earlier Patent No. 2,604,164.

Knife 161 cuts the blank from the length of stock and the forward edge is delivered between fingers 203204 of assembly 190.

While one form or embodiment of the invention has been shown and described herein for illustrative purposes, and the construction and arrangement incidental to a specific application thereof have been disclosed and dis cussed in detail, it is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor to its specific embodiment shown herein, but that extensive deviations from the illustrated form or embodiment of the invention may be made without departing from the principles thereof.

I claim:

1. A roller forging machine comprising a frame, a die assembly comprising plural roller die elements journalled in the frame, means for feeding stock to the die assembly comprising a conveyor, the roller die elements having complemental matrix grooves for forming the blanks, one of such die elements being provided with side walls which limit lateral flow of the metal, the surface of such die element having arcuate recesses inside said side walls so as to give extra thickness to the opposed longitudinal edges of the flash, the other die element having recesses to receive said side walls during rotation, a longitudinally movable assembly provided with fingers to receive the blank as it emerges from the dies and guide the same.

2. A roller forging machine comprising a frame, a die assembly comprising plural roller die elements journalled in the frame, means for feeding stock to the die assembly, said feeding means including a member mounted for sliding movement longitudinally of the frame, inwardly moving fingers carried by said member which grip the stock to advance it, cams for moving the fingers inwardly during forward travel of the member, driving means for moving the member comprising driving gears associated with one of the die elements, gears driven thereby and cranks carried by the latter gears, the roller die elements having complemental matrix grooves for forming the blanks, one of such die elements being provided with side walls which limit lateral flow of the metal, the other die element having recesses to receive said side walls during rotation, a bracket mounted for sliding movement in advance of the roller die elements and being movable by said die elements in the direction of travel of the work, and lingers carried. by said bracket to guide the work after it leaves the die elements.

3. A roller forging machine comprising a frame, a die assembly comprising plural roller die elements journalled in the frame, a channel through which the stock moves prior to delivery to the die assembly and a heating element in said channel, supporting means for the channel comprising a fixed frame member provided with trackways, a slide mounted for movement on the trackways, rack and pinion means for moving the slide, and a support for the channel rotatably carried by the slide, the roller die elements having complemental matrix grooves for forming the blanks, one of such die elements being provided with side walls which limit lateral flow of the metal, said side walls engaging side surfaces of the other die element during rotation, a longitudinally movable assembly provided with fingers to receive the blank as it emerges from the dies and guide the same.

4. A roller forging machine comprising a frame, a die assembly comprising plural roller die elements journalled in the frame, means for feeding stock to the die assembly including inwardly movable fingers which grip fingers longitudinally of the frame, a channel through which the stock moves prior to delivery to the die assembly and a heating element in said channel, means for supporting the channel and for moving it longitudinally of the machine and for swinging it to a perpendicular position, comprising a fixed frame member provided with inwardly facing trackways, a slide carried by the latter and having a rack portion, a manually rotatable Pinion journalled in the frame member, the slide having a socket and the channel being provided with a stud rotatably received in the socket, the roller die elements having complemental matrix grooves for forming the blanks, one of such die elements being provided-with side walls which limit lateral flow of the metal, the other die element having recesses to receive said side walls during rotation, a longitudinally movable assembly provided with fingers to receive the blank as it emerges from the dies and guide the same. 1

References Cited in the file of this patent UNITED STATES PATENTS -Bai1ey.- June 29, Walker Jan. 11, Shippee May ,2, Seaman V June 29, Bray et al. May 12, Tomkins --s Dec. 28, Bradley Oct. 30,"

Edwards u Sept. 14, Barnhart "is. Oct. 29, Sheehan i.-.- t--.- -v---tuly .12, Menu ""4 n June 12,

w-w t-'- NQV- 8,

Grue jen "He-v O t 2, 

